Multiple Choice
Soil texture refers to the relative amounts of ________ in soil.
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35. Soil
Soil and Nutrients
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Which of the following is an example of an inorganic plant nutrient that plants commonly absorb from the soil as an ion?
A
Starch (a polysaccharide)
B
Glucose ()
C
Nitrate ()
D
Chlorophyll (a photosynthetic pigment)
Verified step by step guidance1
Understand the difference between organic and inorganic compounds: Organic compounds typically contain carbon-hydrogen (C-H) bonds and are often produced by living organisms, while inorganic compounds generally do not contain C-H bonds and include minerals and ions found in the soil.
Identify the options given: Starch is a polysaccharide (a complex carbohydrate), Glucose is a simple sugar with the formula C6H12O6, Nitrate is an ion with the formula NO3⁻, and Chlorophyll is a pigment molecule involved in photosynthesis.
Recognize that starch, glucose, and chlorophyll are organic molecules because they contain carbon-hydrogen bonds and are synthesized by plants, not absorbed as ions from the soil.
Recall that plants absorb essential nutrients from the soil primarily in ionic form, such as nitrate (NO3⁻), phosphate (PO4³⁻), potassium (K⁺), and others, which are inorganic ions necessary for plant growth.
Conclude that nitrate (NO3⁻) is an example of an inorganic plant nutrient ion absorbed from the soil, distinguishing it from the organic molecules listed.
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